<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>自动换行</title>
    <style>
        .box{
            display: flex;
            /* 自动换行 */
            flex-wrap: wrap;
            width: 1000px;
            height: 500px;
            border: 3px solid red;
            margin: 100px auto;
        }
        .box div{
            width: 250px;
            height: 200px;
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div class="box">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
    </div>
</body>
</html>